The wine produced in the NW of Portugal- vinho verde -is unique and one of the most important sourceof these familys incomes besides being one of the agricultural products that contributes to spread the nameand image of Portugal all around the world. Analysing the temperature and rainfall data series of one of thestation of the climatological network of this region (Felgueiras), we find argument that may explain the wineproductivity lowest years of the last two decades (1988, 1997, 1998). Temperature and rainfall inter and intraannual rhythms show clear évidences of the impacts both on the plant and on pathologies.